cristal.cpp: In function 'void citire_graf()': cristal.cpp:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result cristal.cpp:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result cristal.cpp: In function 'int dfs(int)': cristal.cpp:23: warning: comparison between signed and unsigned integer expressions cristal.cpp:45: warning: no return statement in function returning non-void cristal.cpp: In function 'int main()': cristal.cpp:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result cristal.cpp:51: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result